Tuensang experiences a subtropical highland climate (Köppen: Cwb), characterized by distinct seasons and influenced by its altitude. Summers (April to June) are generally mild and pleasant, with temperatures ranging from 15°C to 25°C.
The monsoon season spans from June to September, bringing heavy and sustained rainfall which frequently causes landslides and road blockages in the region. Winters (November to February) are quite cold, with temperatures often dropping to single digits (around 4°C to 10°C), though snowfall is rare in the town itself. The best time to visit is during the dry, cooler months from October to April, when the skies are clear and the weather is highly favorable for travel.